As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON A FLIGHT FROM CVG TO MYR, THE HYDRAULIC NR 2 LOW PRESSURE CAUTION MESSAGE OCCURRED IN FLIGHT. SYSTEM PRESSURE WAS LESS THAN 15 PERCENT. CREW DECLARED AN EMERGENCY AND MADE AN UNEVENTFUL LANDING BACK AT CINCINNATI. THE NR 2 RESERVOIR WAS IDENTIFIED AS BEING THE CAUSE OF THE PROBLEM.